Cerium-doped zinc oxide photocatalyst and preparation method thereof

A photocatalyst, zinc oxide technology, applied in the direction of physical/chemical process catalysts, metal/metal oxide/metal hydroxide catalysts, chemical instruments and methods, etc., can solve the difficult and controllable preparation of catalytic degradation efficiency catalysts, etc. problem, to achieve a good degradation effect

Pending Publication Date: 2019-08-09
HANGZHOU POLYTECHNIC
View PDF0 Cites 6 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, the preparation of Ce-doped ZnO catalyst mainly adopts sol-gel method, chemical precipitation method, hydrothermal method, etc., and relatively few Ce-doped ZnO catalysts are prepared by electrodeposition method, because electrodeposition method is generally used for doping activity. Components, and the doped metal cations are generally deposited on the surface of the carrier by electrochemical reduction; in addition, because the deposition voltage, current density, solution composition and other parameters have a great influence on the performance of the catalyst during the electrodeposition process, it is difficult to control Catalysts with high catalytic degradation efficiency

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Cerium-doped zinc oxide photocatalyst and preparation method thereof
  • Cerium-doped zinc oxide photocatalyst and preparation method thereof
  • Cerium-doped zinc oxide photocatalyst and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

preparation example Construction

[0024] The invention provides a method for preparing a cerium-doped zinc oxide photocatalyst, comprising the following steps:

[0025] With zinc as the anode and the inert electrode as the cathode, it contains conductive salt, Ce 3+ The aqueous solution of 2-methylimidazole is electrolyzed as a conductive solution to obtain Ce / ZIF-8;

[0026] The Ce / ZIF-8 is calcined to obtain a cerium-doped zinc oxide photocatalyst.

[0027] The present invention uses zinc as the anode and the inert electrode as the cathode to contain conductive salt, Ce 3+ The aqueous solution of 2-methylimidazole is electrolyzed as a conductive solution to obtain Ce / ZIF-8.

[0028] In the present invention, the anode is preferably a zinc sheet, the thickness of the zinc sheet is preferably 0.05-1 mm, and the width is preferably 1-2 cm. The present invention has no special limitation on the length of the zinc flakes, and the length can be selected according to the amount of zinc flakes.

[0029] In the p...

Embodiment 1

[0042] Take 50mL of deionized water, add KCl to make the concentration 1.0mol L -1 KCl solution, adding Ce(NO 3 ) 3 ·6H 2 O 0.025g, 2-methylimidazole 3.8g, stirring and dissolving; Get Zn sheet 1g, clean the oxide film on Zn sheet surface and make anode, and graphite sheet is done negative electrode, press figure 1 Connect the device, the constant current is 0.018A·cm -2 The current density is reacted until the anode Zn sheet dissolves up to 98%, the power is turned off, the electrolyte is taken out and filtered, the gained solid is washed with deionized water to neutrality, and dried to obtain Ce / ZIF-8; the obtained Ce / ZIF-8 is In a muffle furnace at a heating rate of 5° C. / min, the temperature was increased to 500° C. for 3 h, and after cooling, a 0.5% Ce / ZnO photocatalyst (the cerium accounted for 0.5% of the total mass of the Ce / ZnO photocatalyst) was obtained.

[0043] figure 2 It is the XRD pattern of the Ce / ZnO photocatalyst obtained in 1 in the embodiment. Depe...

Embodiment 2

[0046] Take 50mL of deionized water, add KCl to make the concentration 1.0mol L -1 KCl solution, adding Ce(NO 3 ) 3 ·6H 2 O 0.1g, 2-methylimidazole 3.8g, stirring and dissolving; Get 1g of Zn sheets, remove the oxide film of Zn sheets and clean them as anodes, graphite sheets as cathodes, press figure 1 Connect the device, the constant current is 0.018A·cm -2 The current density is reacted until the anode Zn sheet dissolves up to 98%, the power is turned off, the electrolyte is taken out and filtered, the gained solid is washed with deionized water to neutrality, and dried to obtain Ce / ZIF-8; the obtained Ce / ZIF-8 is In a muffle furnace at a heating rate of 5° C. / min, the temperature was increased to 500° C. for 3 h, and after cooling, a 2% Ce / ZnO photocatalyst was obtained.

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more

PUM

PropertyMeasurementUnit
thicknessaaaaaaaaaa
widthaaaaaaaaaa
Login to view more

Abstract

The invention provides a preparation method of a cerium-doped zinc oxide photocatalyst. The preparation method comprises the following steps that zinc is taken as the positive pole, a noble electrodeis taken as the negative pole, an aqueous solution containing conducting salt, Ce<3+> and 2-methylimidazole is taken as a conducting solution for electrolysis, and Ce / ZIF-8 is obtained; the Ce / ZIF-8 is calcined to obtain the cerium-doped zinc oxide photocatalyst. According to cerium-doped zinc oxide photocatalyst and the preparation method thereof, the zinc is taken as the positive pole, anodic dissolution occurs under the action of a certain current, Zn<2+> enters an electrolyte to react with the 2-methylimidazole to generate ZIF-8 with a porous structure, the Ce<3+> in the solution is loadedin the porous ZIF-8 structure, and calcination is carried out to prepare a Ce / ZnO photocatalyst, and the Ce / ZnO photocatalyst is applied to the field of organic pollutants of photocatalytic degradation, has good application prospects, and has a good degradation effect on methyl orange, methylene blue and the like.

Description

technical field [0001] The invention relates to the technical field of photocatalysts, in particular to a cerium-doped zinc oxide photocatalyst and a preparation method thereof. Background technique [0002] Photocatalytic degradation of organic pollutants is one of the new wastewater treatment methods, which has the characteristics of complete degradation, greenness, and sustainable development. However, the catalyst has problems such as low utilization rate of sunlight and low degradation efficiency. [0003] ZnO is a common photocatalyst. As an n-type semiconductor material, its bandgap at room temperature is 3.37eV. Under the irradiation of ultraviolet light with a wavelength less than 387nm, it can be excited to generate photogenerated electron-hole pairs, thereby producing Active free radicals (·OH and ·O 2 – ), has a good degradation effect on organic pollutants. However, ZnO has a large band gap and can only absorb ultraviolet light, resulting in low utilization o...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more

Application Information

Patent Timeline
no application Login to view more
Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/10C02F1/30C25B3/12C02F101/36C02F101/38C02F101/34C25B3/13
CPCB01J23/10B01J35/004C02F1/30C02F2101/36C02F2101/38C02F2101/34C02F2101/40C25B3/13
Inventor 董虹星刘秋平艾宁俞晶晶赵雨陈语芙
Owner HANGZHOU POLYTECHNIC
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Try Eureka
PatSnap group products

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic.

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap